If you can fix a Dart you can build a trike.
I have been gathering parts for a home built trike. So far I have a 360 motor and auto trans out of a Diplomat cop car(yes they made them). A Jaguar IRS( made in USA, shipped to UK). A Mopar marine oil pan (thick aluminum). Aluminum slots (15X10). Harley size neck and bearings. Mufflers (Supertrapps) Cooling system with electric fans, MT valve covers,
Read and look at photos of v8 trikes, you can do it.